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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b117beae7a068673c2088c579d37b56b70f0aeaa4273d2dfd039e1eeb01c5bd6' 
  AND token = 'FMvQx6dlQW4IcXPfj+xftcLc7wBiwh5ak4jlzbfwkUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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