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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ff3781ba2b6364817b693d869e64c3b86659b284acea136e8fb46e66981d76' 
  AND token = '6C3wW5SjayU9jnxM4UizTy1EjXAhZKku184OoZuUxZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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