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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9a3e882f3704c500f0acb9c05861c4ddbd6be0599c7c9194745bb93bb9c1e8' 
  AND token = 'nT3wDk5k4F8KpxrBgD8/0lmd60XPN7EtKXv8NFfFYLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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