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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e57635350502c80c73245f2a2edb7baa46a0aefb901aae5907ba50b8debd07c8' 
  AND token = 'qtt4bDbwpPNH35o8oQI4PRUuyw++lXA37wY1qQZiuY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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