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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4860819a66467b3f598ffd0ed32aa69d14f1bd6496eb000cde96b48d77986ee' 
  AND token = 'c2bJOT3KV0Y1lNv6Akf9b7GPiIXeQKLjEzs0M5DfPHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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