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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1052169141563c0b3cffe42418b2315f61d7094b95b00b4a25604c76194a60' 
  AND token = 'pO+gItjzBEUym7WmWd8z1KYjzNDc4d2nzyq52qd34XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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