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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03062e02de4164c7b33ba56273e5ee3e20773bab0eae3b58142d30516beba5b7' 
  AND token = 'LOq4of6v01tZK4ZEImAwpS3jnBTsDztFSFmIyOMFVqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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