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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e4e54a4cb4e7afe314d913d99e02230fb899419a38dbe88652b914162f17c8' 
  AND token = 'A3W33W7W/ObnVMgWNMX9QX+1SYDpUhenhAl2dNBBJ8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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