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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d6c99fc48fd1b5167dd3e5c6777b515ccb45095a86409a7aa3db6e2556ac3e' 
  AND token = 'iwze+uQ9IlByZeHcNbHgxpHDk4DtDV3L+trsdPcyWHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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