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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c6eee5f65819214d6e59be9159158ec0b60975157d604592c40febfacd5040c' 
  AND token = 'bRYhkvTaRIjVqyrH5UhnWx0CK3Gt87usr5HqIpAkD9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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