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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1f868bed89c633795abe1fc89cad85b1e9aa38d65b1fa3412a147d0731bfa0' 
  AND token = 'SShFwBRP5+vfer0P9LkRv8gmsvw4Zs9AYEMwL+01P/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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