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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba8ecc5487562e4e9ce383aa09cf72dc550203593142ba56a83d11f913958f35' 
  AND token = 'MNI5hQltEtbTihxjhYqpD3E+hlSni26fGIgFv/ic/t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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