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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6878b68fa2249e1ade39637f78c5e838579638553eb0c5a647eeacb0299de1d5' 
  AND token = 'Uwy139BKw0VwtjWHaQ+C/OIt9IWcEmAODBbCxK2j19A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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