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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42fb3ea96c5b913cf1401bed9c2014b2098a9d82d8fc069cf9b58b099784ef92' 
  AND token = 'c5hbJ5ldMMHWVnw+fJkY/YdGT+h89Mm00U7YwCgSla4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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