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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e8ca5fbc18fa4264e95664edd19e87aa368c6b570549a24d25a8aa0a901ec1' 
  AND token = '0REthAICcwaDLFFy849kzHbpDd8e4xKYgc9/uoG+rWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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