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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93c5cd64b15a59a0f850b83c22de810de46354a8265035df0106485b83a93e6e' 
  AND token = 'sCLgpMl77tb2WBVeTZuspf8HIIafn59ifqctMY05GBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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