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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34e0173613df7b6e74fdc2955dec8c655d98bea584eea1c82eddd285b3790422' 
  AND token = 'eiWVzTIKrOP87ahUDEbWiDY/7LVE3zHSW2eUrkOS8Vw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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