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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b92d810988652eccf2c6a74fc6f6305f7b7d6dffe535ceadde7b1b19fa85ed8c' 
  AND token = 'Yt41j9kI1RsEjMHk1/E4Mbv5JHThjO02MrEoPpFK2rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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