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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '009751f02062b4b52a062903d9968be1cdab7c1727a3a88fce5f531e36b5ce04' 
  AND token = 'PiwE6Hd3fwn0WA+6MzocvEDZVAw1OOtZvJ8Z0H5F9vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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