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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa7fabdbc0d4532a05d5c93599e636a634a971f07fa89d3271b106ae90e870d' 
  AND token = 'AoLvatjDwRxzaiBalii1lQx7fPPuvOzqmWVld8wSIXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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