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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff665e74d0cb64cc2682eff056ab6fe452cb7b4a7279b90df7cd500f58a5e8b' 
  AND token = 'f0ZBtAMmTqFaxNgEKdSGgk6alGTPPJFMbb3HSH3o7GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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