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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0587bb67add90ce9c765ea44bd89044ba8218249e649ea2b31ca4103e0ce7c' 
  AND token = 'kXqBEOT/D7aFU130H1A1DqfHLK3dyv6PDncdMA71hVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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