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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0d090d927ccd32c06dde7df60729e3da61c0ccb51e6a111e23db7c1991b993' 
  AND token = 'xMxzOl4bB7+msq7iY8fQAJu4jTcjK8uvKn8dxvrjLy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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