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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95ba55ef8cccb69c022b9ae9e3e5995475c5ba79c60ad97d81f977651ff00cd' 
  AND token = 'fssUG7Zi4Q2pYKEGKSO/sBtcPO+6oP9BdFKYk0h76Ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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