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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6589d8ddc7051286b2fae04b30c9308fd5a32582f4955940bbccdf6c09cfefa' 
  AND token = 'cyd1UIKMi7xFFEkqp6pPLFy/b3ai3fFupdRv41IPZ5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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