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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '026159e72c6812060008f8a6d2ce85bd16a1a7d35e5ac6d03dde622ab8019d00' 
  AND token = 'v+wV3N9aTRcGyYrzvXn2rDdd77vnv3Hdj+8fjCi3lcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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