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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581fa7afee5f715877962ad2368211c7f8370dde811692f7cbf0fb36f10bf170' 
  AND token = 'zQj8jR0jWZs9DHIanPpg4kq4F0Z/9XE95HOeKbrfg4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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