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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a84b281097f562f650ee4fa5ca1b2b45a249b87d9c3ee6e69ab917601660941' 
  AND token = 'PtQmKBteRRIWAkymlzGUr309eyte1rq/vYIKj3OYkt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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