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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fb3c956e0ae0dc0cea6e199c21dc7042f961e5d7bf8083f88c782be99755325' 
  AND token = 'UJNHCgZN9fZzHayafJHA7jDuEb/E9O0OIbFn3JW21H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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