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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7235c19eec768003e0e8f6389ff0e6ca958a8b67c2bcc0aefbeee8c33b8166e' 
  AND token = '15Ss9+7mws5s1N+oO8wMZQY59OvkdmM23rbdoT+56xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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