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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e2bd7ec25c2630897ae865310459b098b2ce5310e9ea33aa93bb759476991c3' 
  AND token = 'HBOLMPX+UJ1m8wjVRg0w5VHfsTQkXI39nlJcuBpOTS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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