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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186791d4fbbf3bcec1e808d1722c8d8f6b2b2d0f7be7c05a3cffdcc0c41b658b' 
  AND token = 'dFK/UxWILcd8iKvEzYPRz87ZOCMmVJvC5goH2sLug9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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