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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d6fc3b1ab6d4a0bc0e670bf31f7c4f4925f2d78ea4abb8eae7bda9e647f6629' 
  AND token = 'us5NkMEcMCS89Q8UGyYShQ6C+e4QvdlmP0nLLFee58w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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