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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c17f590948faebbc8f9035d4bbb7a6b4204fc0cae152e63240b6b026590a0f' 
  AND token = '6eWHDKA0h2Xphq7rWpDeczjrsK0ed2leloBeuUPL5MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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