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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee19f9c83fa30198bdbd1206340ecf716eeb62c401d40a30a243ed4614395ed' 
  AND token = 'QQSsrU3jzI9S9cae+3LQqgc6vgV7GXiYil05xNLfjcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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