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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e319a97c23092943db16d9af7db372249e3e9da6a37560eb3a71b0e822ad33f4' 
  AND token = '/HSpEe2y+pQEXrYJu2g/v3BtDvc0f72mbzSQQzGscY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}