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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b14b27e3322332f4a2f23f315e1e516796ee97c2222fb8ba4374a96ff7565b' 
  AND token = 'XvrOHh/9BNydaTB4g139X8USR3rN0Hc84V3O7AqtS9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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