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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3caa8bf1442699282474062b03e4d11226629e40432825ed7567fc903e121f74' 
  AND token = 'rHXOoJvo5fJ1EItU2P5tkl6tdf+Oul7OEQW/qvYXsig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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