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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942d4d7ee917f09f2803cc4cd99a58c57e539931f941f4d29a807ce687e49f80' 
  AND token = 'LYeoSfnWUhNajLrTJ6qHC5LF0N825JehkxB8dH/bXI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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