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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb85c82610985a102f0154894dead079076d93bd4fe8b547e3f7e4975e6d34e' 
  AND token = 'yo54LkUoZcTdz9f0pNk5QUuyRcZOkrRPjIu3DqpMiRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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