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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a10e3ef8f483f9d2c755840985ad5457a245f83f4a3c6710dc42e4a4b83d91' 
  AND token = 'Bi7lodVrF5bTxCffGRRWUrP/I2vR1YLYBo73GhS38nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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