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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a820e327f7be059d3cf0b3ed0f4e1325966f7e4abcd146540e342b6457749bf' 
  AND token = 'bCa39ge4+QGoGMgaXG3x8l0nX3t1WffpeFBztwicF3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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