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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3268f8294063f779a88bd8850af9f0cf2ec98d40e87c79594787fc53e8508270' 
  AND token = 'iMqdHQCW7AOd2je3cw5NO99RAoHn+N9ngcQm8O19HU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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