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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b86ee9ed6c6cd30e7ac621eb13402be27e4a4a65ebadbd034c16cb547d11be1' 
  AND token = 'CxHViw6R4nIOGPCiSLvQXmz3SzHSLjHVh+A1pzZbYg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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