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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdec9f2a4e4f5aaea235a403b07c17a3697125d2fe5a7e84a98a4d1bf3c4ec84' 
  AND token = 'WqC5I9CVXc0FmeJg24EaknLfcYktp4/N0T0qjS6jzWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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