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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3606cbac4518b5ab7d8f4858d09237ea18df1192f3b449c30bec63e4eb0abb7f' 
  AND token = 'k7pIl0KMMFZOCFh//7ztrwkXI3sl5zEcEvwxM4NLWI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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