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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ef56933a96ba66ca2090948aa4951b9c74866a628deb2620b4f5fba627280c' 
  AND token = 'O+G8QpivM5cGAyt3rrGZA7YqWMeHohxwvtYui/yCCl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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