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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a6510d341fba7faa8f602700d67bcdb54bd35f8b76595d90b8d83448d45ba7' 
  AND token = '0QNOsx9CFA5HAclD20QSNC/IRQnULuR86P0XcTCeYos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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