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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a5094e3bff2bf57699cb1adb67b9a795b9e03aa0b3eaef1e2ab016c55e6b2f' 
  AND token = 'QgPRhUtP8+f7rcTTG/16vOPONaB7q8bK3mlxJbC4F+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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