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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb576a5b7bb3092c3d84fe11ef1e926b12e1bc6ddcf5b48f3ae9fcd0bc124d2' 
  AND token = '1XsIyvOqxHsGXMTo75A6E85Jug+dJd9yBjaEV6xry3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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